IT Security Stack Exchange
IT Security Stack Exchange

Questions tagged [rc4]

RC4 (Rivest Cipher 4) is a type of stream cipher.

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RC4 support in SSL configuration

GitHub recently improved its SSL setup by removing RC4 support: To keep GitHub as secure as possible for every user, we will remove RC4 support in our SSL configuration on github.com and in the GitHub API on January 5th 2015. RC4 has a number of…
rink.attendant.6
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Why is it necessary to minimize redundancy in the ciphertext of a stream cipher?

I am utterly confused about this. I understand why you would want to minimize redundancy if you're using a substitution cipher, but why is this necessary when using a stream cipher such as RC4? Since the attacker does not have the key, how would…
Legend of Overfiend
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Which of AES modes are safer and faster for transferring data over the network?

I have using Crypto++ in Qt and use of AES Algorithm for encrypting files. I know about AES modes and their applications. I have use of StreamTransformation method for encrypting files in CBC and EAX modes. Now I want to Transfer data over the…
BattleTested_закалённый в бою
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Reconcile IMAP4 RFC with No RC4 RFC

RFC 3501 states: IMAP client and server implementations MUST implement the TLS_RSA_WITH_RC4_128_MD5. RFC 7465 states: o TLS clients MUST NOT include RC4 cipher suites in the ClientHello message o TLS servers MUST NOT select an RC4 cipher…
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xls RC4 encryption password from key

I asked this question on stackoverflow, but thought it may be more appropriate here. I have a key from a RC4 encrypted excel sheet (xls), along with the salt, and hash, etc. and I have decrypted the file using this program. Is there a way to recover…
chase
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How secure is UltraVNC?

I've found that UltraVNC Single Click is an interesting alternative to TeamViewer. However it as far I understand uses RC4 to encrypt. Would you recommend this tool to remote desktop bearing in mind the security?
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