Knowledge Base

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Cipher Suite: TLS_­ECDHE_­RSA_­WITH_­CHACHA20_­POLY1305_­SHA256

Summary

code:
(0xcc, 0xa8)
IANA Name:
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256

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Components

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Key Exchange Method
Name
Elliptic-curve Diffie–Hellman Ephemeral (ECDHE)
Security
Ephemeral Elliptic-curve Diffie–Hellman[91][92] is a variant of Elliptic-curve Diffie–Hellman[490][491] key exchange that has forward secrecy[135][136][137][138], and does protect past sessions against future compromises. If long-term secret keys or passwords are compromised, encrypted communications and sessions recorded in the past cannot be retrieved and decrypted.
Recommendations
Always prefer cipher suites with PFS property over the non-PFS ones. Note that performance considerations implies preferring Ephemeral Elliptic-curve Diffie–Hellman[91][92] over Ephemeral Diffie-Hellman[142][143][144][145].
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Authentication Method
Name
Rivest–Shamir–Adleman (RSA)
Security
Rivest–Shamir–Adleman[80][81][82] is a digital signature[231][232][233][234] algorithm, which is considered secure, however there are known weaknesses[322][323][324][325][326].
Recommendations
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Encryption Type
Name
ChaCha20
Security
The stream cipher[78][79] ChaCha20[181][182][183][184] is a variant of the algorithm Salsa20[111][112][113] is considered secure [316][317] and gives better performance for mobile devices.
Recommendations
Prefer stream cipher[78][79] ChaCha20[181][182][183][184] in case of mobile devices.
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Encryption Key Size
Name
128
Security
The symmetric key[193][194][195] withkey size[438] more than 128 bits as it is should be according to National Institute of Standards and Technology[428][429] so it is not vulnerable to preimage attack[215] and it cannreliably prove that message came from the stated sender (its authenticity) and has not been changed, so connection is not open for a man-in-the-middle attack[414].
Recommendations
Remove the cipher suite from the list of cipher suites supported by your server.
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Message Authentication Code
Name
POLY1305
Security
message authentication code[128][129][130][131] is a message authentication code based on universal hashing[301][302][303][304] which is considered secure. It provides authenticated encryption[563] which simultaneously assure the confidentiality[198][199][200] and authenticity[201][202][203] of data. Together with stream cipher[78][79] ChaCha20ChaCha20-Poly1305[211][212][213] gives better performance on mobile devices under the same conditions of security.
Recommendations
If your application or requirements specifically call for the use of a message authentication code[128][129][130][131] that does not provide authenticated encryption[563] prefer block cipher mode of operation[293][294][295][296][297] (eg: counter with CBC-MAC[266][267][268], Galois/Counter Mode[65][66][67][68] or message authentication code[128][129][130][131] (eg: Poly1305[289][290]) that proved authenticated encryption over the ones which does not provide it. In case of a hashed message authentication code[418][419][420][421][422][423][424] prefer message authentication code[128][129][130][131] based on Secure Hash Algorithm 2[71][72][73] over the ones based on Secure Hash Algorithm 1[204][205][206].