What is SHA-1?
SHA-1 is a cryptographic hash algorithm that creates a 160-bit hash, usually shown as a 40 character hexadecimal string.
ALT SHA-1 Hash Generator
Type or paste text below to instantly generate a SHA-1 hash. All processing happens locally in your browser.
ALT SHA-1 Hash Generator creates a 160-bit SHA-1 checksum from text, strings, or test values. SHA-1 is useful for legacy checks and compatibility, but it is deprecated for modern security because collision attacks are practical. For new security-sensitive work, use SHA-256 or stronger algorithms.
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SHA-1
SHA-1 Questions
What is a SHA-1 hash?
A SHA-1 hash is a fixed length fingerprint made from text or data. It can be used to compare values, but it should not be trusted for modern security-sensitive uses.
Can SHA-1 be decrypted?
No. SHA-1 is a one way hash, not encryption. You can compare a value by hashing it again, but you cannot decrypt SHA-1 back to the original text.
Is SHA-1 deprecated?
Yes. SHA-1 is deprecated for digital signatures, certificates, and modern security work because collision attacks are practical. Use SHA-256 or stronger algorithms for new systems.
What is the difference between SHA-1 and SHA-256?
SHA-1 creates a 160-bit hash and is deprecated for security. SHA-256 creates a 256-bit hash and is a safer modern choice for checksums, signatures, and integrity checks.
Can I use SHA-1 in PHP?
PHP has a sha1 function for compatibility and legacy workflows. For passwords, use password_hash. For modern integrity or signature workflows, use SHA-256 or a stronger option.